We are glad you are enjoying the game, that is why me make games after all !
As for your first and second remark, I will check in-game but it seems odd. I do remember the cast being sensibly shorter than Leck Lorus initial fear, which is 5 seconds.
Sacred Feast is indeed considered as a damage, so that is working as intended
As for the voice acting, it's either been adpated to sound better when spoken or at the contrary sligthly modified to fit in the text box. It's not exactly the same at all times.